my gs300 na-t has seen private shops, freelance guys, as well as the dealership it all depends on what you need done.
around Tampa there are tons of awesome options.
Titan in Orlando makes monsters and is great with 2jz's
Xat and DC both have grade A reputations
Grip automotive is Grip Industry and is over in Melbourne and they make some monsters as well.
freelance guys you just have to run across. the freelancers that have worked on my car are not longer in the area. kirk is about the only one i know of in the area thats a 2jz specific guy i have never worked with or even met him but i have never heard a bad thing about him or his work.
-james